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Summary of Significant Accounting Policies (Schedule of Reserves for Excess and Obsolete Inventory) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of year | $ 5.1 | $ 4.4 | $ 4.6
Provision charged to expense | (3.4) | (2.2) | (2.0)
Inventory disposed | (1.2) | (1.2) | (2.1)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | 0.2 | (0.3) | (0.1)
Balance at end of year | $ 7.5 | $ 5.1 | $ 4.4

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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